Environmental tracers age dating young groundwater
H), and other chemical and isotopic substances in ground water, can be used to trace the flow of young water (water recharged within the past 50 years) and to determine the time elapsed since recharge.
Information about the age of ground water can be used to define recharge rates, refine hydrologic models of ground-water systems, predict contamination potential, and estimate the time needed to flush contaminants from ground-water systems.
AU - Osenbrück, Karsten AU - Aeschbach-Hertig, Werner AU - Solomon, D.
Kip AU - Cook, Peter AU - Rózánski, Kazimierz AU - Kipfer, Rolf PY - 2010Y1 - 2010N2 - Many problems related to groundwater supply and quality, as well as groundwater-dependent ecosystems require some understanding of the timescales of flow and transport.
In the atmosphere, these substances have mixed and spread worldwide.
These atmospheric substances, such as tritium (H) in water vapor from detonation of nuclear bombs in the 1950s and early 1960s,and chlorofluorocarbons (CFCs) from refrigeration and other uses from the 1950s through the 1980s, dissolve in precipitation, become incorporated in the Earths hydrologic cycle, and can be found in ground water that has been recharged within the past 50 years.
Locating the position of the mid-1960s bomb peak is difficult due to the required high density of vertical sampling and, therefore, is often an impractical means of obtaining ground-water age information. Ekwurzel, B., Schlosser, P., Smethie, Jr., Plummer, L. L., Weppernig, R., and, Stute, M., 1994, Dating of shallow groundwater: Comparison of the transient tracers Kr: Water Resources Research, v.
As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.
Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance.
In systems younger than the mid-1960s, the bomb peak will not be present due to radioactive decay.
Although initial H input to ground water and may be used to determine the position of the mid-1960s bomb peak in recharge areas.